Shift control method for automatic transmission

Details Shift control method for automatic transmission Shift control method for automatic transmission

1997-01-02

1998-12-29

Marmor, Charles A.

Interrelated power delivery controls, including engine control

Transmission control

Transmission controlled by engine

477155, F16H 6106, F16H 6108

Patent

active

058533494

ABSTRACT:
A control for shifting from an off-going speed range to an on-coming speed range comprises an off-going range releasing stage, an on-coming range void-stroke-clearing stage, an on-coming range engaging stage and an on-coming range final stage. During the off-going range releasing stage, an off-going engaging element is released in response to a shift command signal. During the on-coming range void-stroke-clearing stage, the engagement-actuation pressure of the on-coming engaging element is set at a predetermined high-pressure for a predetermined time period after the shift command signal is generated, whereby the void stroke of the on-coming engaging element is cleared. During the on-coming range engaging stage, after the completion of the on-coming range void-stroke-clearing stage, the on-coming engaging element is engaged. During the on-coming range final stage, following the on-coming range engaging stage, the on-coming engaging element is engaged completely. In this control, based on the condition of the engaging operation of the on-coming engaging element during the on-coming range engaging stage, the predetermined time period for the on-coming range void-stroke-clearing stage is corrected for a next shift operation.

REFERENCES:
patent: 4707789 (1987-11-01), Downs et al.
patent: 4982620 (1991-01-01), Holbrook et al.
patent: 5062321 (1991-11-01), Koenig et al.
patent: 5072390 (1991-12-01), Lentz et al.
patent: 5551930 (1996-09-01), Creger et al.
2244 Research Disclosure, (1994) Mar., No. 359, Emsworth, GB, p. 150.
2244 Research Disclosure, (1994) Mar., No. 359, Emsworth, GB, p. 142.

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